This file is indexed.

/etc/brltty/Input/hm/fnkey.kti is in brltty 5.5-4ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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###############################################################################
# BRLTTY - A background process providing access to the console screen (when in
#          text mode) for a blind person using a refreshable braille display.
#
# Copyright (C) 1995-2017 by The BRLTTY Developers.
#
# BRLTTY comes with ABSOLUTELY NO WARRANTY.
#
# This is free software, placed under the terms of the
# GNU Lesser General Public License, as published by the Free Software
# Foundation; either version 2.1 of the License, or (at your option) any
# later version. Please see the file LICENSE-LGPL for details.
#
# Web Page: http://brltty.com/
#
# This software is maintained by Dave Mielke <dave@mielke.cc>.
###############################################################################

note Function Key Bindings
note + Function-b: skip blank windows on/off
note + Function-c: cursor show/hide
note + Function-d: display mode attributes/text
note + Function-f: screen image frozen/unfrozen
note + Function-h: help screen enter/leave
note + Function-i: skip identical lines on/off
note + Function-l: learn mode enter/leave
note + Function-p: preferences menu enter/leave
note + Function-s: status line enter/leave
note + Function-t: cursor tracking on/off
note + Function-u: highlight underline on/off
note + Function-v: bring cursor to current line
note + Function-w: sliding window on/off

hide on
assign function F2+Space
bind \{function}+Dot1+Dot2 SKPBLNKWINS
bind \{function}+Dot1+Dot4 CSRVIS
bind \{function}+Dot1+Dot4+Dot5 DISPMD
bind \{function}+Dot1+Dot2+Dot4 FREEZE
bind \{function}+Dot1+Dot2+Dot5 HELP
bind \{function}+Dot2+Dot4 SKPIDLNS
bind \{function}+Dot1+Dot2+Dot3 LEARN
bind \{function}+Dot1+Dot2+Dot3+Dot4 PREFMENU
bind \{function}+Dot2+Dot3+Dot4 INFO
bind \{function}+Dot2+Dot3+Dot4+Dot5 CSRTRK
bind \{function}+Dot1+Dot3+Dot6 ATTRVIS
bind \{function}+Dot1+Dot2+Dot3+Dot6 CSRJMP_VERT
bind \{function}+Dot2+Dot4+Dot5+Dot6 SLIDEWIN
hide off